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The basic concept for how anti-reflective coatings work is the optical interference model. Each coating layer in the AR stack combines with previous layers to cancel out a broad range of light waves by introducing opposite, or destructive, waves that are out of phase. Thus, reflective properties of that range of light are neutralized. By applying the principle of optical interference, we are able to increase light transmission to nearly 99 percent in most cases. The result is a reduction of reflections over a broad range of wavelengths… and clear, crisp vision for your patients.

Opticalcoating

Most AR producers choose their AR layer design and resulting peak color reflection based on customer preference or visual performance goals. The ability to help control manufacturing consistency is also a major factor. Peak reflectance tends to drift slightly from day to day, affected by environmental changes in production such as vacuum chamber cleanliness or even changes in humidity. Many AR coatings tend to have peak reflectance in the 520 to 550nm range of the light spectrum, the green area of visible light that also tends to be the easiest color to produce consistently. Some manufacturers move the curve peak closer to the blue end of the spectrum, while others move the peak toward the yellow. Visual performance such as eye sensitivity during daytime or twilight has also been cited as criteria for residual color choice. It is, however, difficult to find credible evidence or studies on this subject that will make the choice an obvious one. Feel free to ask your supplier how they chose their peak reflectance color.

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DESTRUCTIVE INTERFERENCE MODEL By causing the reflection from the second surface to be exactly 1/2 wavelength out of phase from the reflection from the first surface, an AR coating causes the two reflections to cancel each other out, eliminating reflection. The destructive interference model used is based on a single wave length of light entering a lens at normal incident. In the case of a real lens coating, the mathematical formula and models used to design an AR coating are much more complex.

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WHY DO SOME AR BRANDS REFLECT A DIFFERENT COLOR THAN OTHERS? When seen from an angle, all AR lenses reflect a small amount of color/hue, typically referred to as residual color. Some AR brands look green, while others appear blue or yellow-green. This is a natural phenomenon associated with the reflectance curve of a broadband AR coating across the visible spectrum of light. AR coatings have a peak reflectance (approximately 1 percent) at some point on the visible light spectrum and it is the color associated with that peak, which is reflected more than other colors.

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STANDARD LENS WITHOUT AR Standard, uncoated lenses can decrease light transmission by up to 15 percent of available light. This is caused by visible reflections on the front and back surface of the lens, as well as internal reflections. The higher refractive index of a lens material equates to the greater incidence of reflections and glare.

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